Diver and Diving Support Equipment

Questions

Multiple Response, 10 points

1. Select all that apply to testing if a mask is a good fit for your face:

[ ]Place the mask in position on your face without using the mask strap.

[ ]Inhale through your mouth.

[ ]Place your face in the water and exhale through your nose. If no air exits the mask, it is a good fit.

[ ]Place the mask in position on your face using the mask strap.

[ ]If no air enters the mask and the mask stays on your face it is a good fit.

[ ]Inhale through your nose.

True/False, 10 points

2. Snorkels are generally worn on the right side of the mask so that they do not interfere with regulators coming over the left shoulder.

( )True ( )False

True/False, 10 points

3. For polar diving, full-foot pocket fins are a better choice than open heel fins.

( )True ( )False

True/False, 10 points

4. Split fins are good for pushing heavy loads against current.

( )True ( )False

Multiple Response, 10 points

5. Select all of the true statements concerning wetsuits:

[ ]Wetsuits are most effective in water temps [ ]Wetsuits are most effective in water temps

above 60F. below 60F.

[ ]Wetsuits should fit snugly to minimize water exchange.

[ ]Are best stored in a cool, dark, and dry location.

[ ]Wetsuits trap a thin layer of water between the suit and the diver’s skin. This water is warmed by the diver’s body and insolated by the wetsuit.

[ ]Are the most efficient form of passive thermal regulation for divers.

[ ]Are best stored in damp, warm areas in order to preserve their thermal characteristics.

[ ]Wetsuits typically become more buoyant as depth increases.

Multiple Response, 10 points

6. Select all of the true statements related to Drysuits:

[ ]All drysuits are easy to decontaminate and appropriate for use in contaminated water situations.

[ ]Drysuits made of urethane coated nylon are very reliable but expensive.

[ ]Are the most efficient form of passive thermal regulation for divers and can increase bottom times dramatically.

[ ]Crushed neoprene drysuits are rugged with good stretch characteristics, and provide some inherent insolation.

[ ]Drysuits made of trilaminate material are lightweight, flexible and relatively rugged, but the material provides no stretch.

[ ]The inflator valve on most drysuits is typically located on the middle of the diver's chest.

[ ]Foam neoprene drysuits provide good stretch and thermal characteristics.

[ ]Vulcanized rubber drysuits are slow to dry and difficult to repair, but have better stretch characteristics than suits made from neoprene or crushed neoprene.

True/False, 10 points

7. Neoprene drysuit seals are more rugged than latex seals, but tend to leak more.

( )True ( )False

True/False, 10 points

8. Scented talcum powder may damage drysuit seals.

( )True ( )False

Multiple Choice, 10 points

9. _____ seals on drysuits are thin and soft; can be trimmed to fit individual divers, but are less rugged than _____ seals.

( )New / old ( )Neoprene / latex

( )Wrist / neck ( )Latex / neoprene

True/False, 10 points

10. Drysuit zippers should be lubricated with silicone prior to diving.

( )True ( )False

Matching Drag and Drop, 10 points

11. Match the drysuit underwear type with its characteristics:

Choice Correct Match Match

Polartec Does not offer as much thermal protection as the other two materials. Is middle of the road with regard to stretch.

Thinsulate Is easy to don. Is less bulky and has good stretch making it comfortable. It does not maintain insulating properties when wet.

Synthetic fleece Is made from polyolefin microfibers. Is water resistant and maintains most of its insulating properties even when wet. Is bulky and does not stretch or breathe.

True/False, 10 points

12. While diving, air is introduced into the drysuit to control buoyancy, to prevent suit squeeze by offsetting the effects of pressure, and to provide some thermal insulation.

( )True ( )False

True/False, 10 points

13. A drysuit should be stored rolled up in a bag in a cool dark place away from sources of ozone such as hot water heaters and electric motors.

( )True ( )False

Multiple Response, 10 points

14. Select all of the true statements concerning scuba regulators:

[ ]The first stage of the regulator reduce intermediate air pressure to ambient pressure at the diver’s mouth.

[ ]Modern scuba regulators are “demand regulators” – they only supply air when divers inhale.

[ ]The second stage of the regulator reduce intermediate air pressure to ambient pressure at the diver’s mouth.

[ ]Scuba regulators have two stages.

[ ]A scuba regulator equipped with a yoke connection can be used on cylinders rated for higher pressure than a regulator equipped with a DIN connection.

[ ]All scuba regulator first stages are environmentally sealed to help keep out contaminants.

[ ]The first stage of the regulator reduces high pressure gas in the tank to an intermediate pressure.

[ ]The second stage of the regulator reduces high pressure gas in the tank to an intermediate pressure.

[ ]NOAA and AAUS require that all scuba regulators be inspected and serviced by an authorized repair technician annually.

True/False, 10 points

15. Blocking the air intake of an oil lubricated compressor can cause oil to be drawn into the air system.

( )True ( )False

True/False, 10 points

16. Oil free compressors operate without any oil in their crankcases.

( )True ( )False

Multiple Choice, 10 points

17. The two main types of compressors systems are _____ pressure, _____ volume compressors used for filling scuba cylinders, and _____ pressure, _____ volume compressors used for umbilical diving.

( )low / high, and high / low ( )low / low, and high / high

( )high / high, and low / low ( )high / low, and low / high

Multiple Response, 10 points

18. To help ensure safety during the filling process, considered the following: (select all that apply)

[ ]Post operating procedures and safety instructions.

[ ]Placing the fill station away from work areas.

[ ]Provide a physical barrier between fill station operator and cylinders during filling.

[ ]Allow only trained, authorized persons to work at the fill station.

[ ]Configuring fill station controls within to the cylinder fill area.

Matching Drag and Drop, 10 points

19. Match the symbol stamped into a scuba cylinder with its meaning:

Choice Correct Match Match

3AL Indicates the serial number of the cylinder, in some cases letters are not included in the serial number

2250 Indicates the hydrostatic test date and that the cylinder can receive a 10% overfill. The overfill symbol only appears on steel cylinders.

8 25 + Indicates the month and year of the hydrostatic test date

P71841 Indicates the cylinder volume

S80 Indicates the cylinder is made of an aluminum alloy

3AA Indicates the cylinder is made of a steel alloy

6 95 Indicates the service pressure of the cylinder

True/False, 10 points

20. Non-galvanized steel tanks are recommended over galvanized steel tanks because they are more corrosion resistant.

( )True ( )False

True/False, 10 points

21. Cylinders that have expired hydrostatic test dates may be filled provided that they have been visually inspected within the past year.

( )True ( )False

True/False, 10 points

22. In order to prevent excessive heat build-up, cylinders should be filled no faster than 300-600 psig/minute.

( )True ( )False

Hotspot, 10 points

23. Use your mouse to click on the rated working pressure (service pressure) of the cylinder marking pictured.

Hotspot, 10 points

24. Use your mouse to click on the valve capable of using a DIN regulator on the H-valve pictured here:

True/False, 10 points

25. You should not look directly at the face of any pressure gauge when turning on a cylinder because of the possibility of a blowout.

( )True ( )False

Multiple Choice, 10 points

26. Which type of buoyancy compensation device is least likely to float a diver in a face up position at the surface?

( )Back-mounted ( )Jacket

( )Horse collar ( )There is no significant difference in how different styles of BCD float divers at the surface.

Multiple Response, 10 points

27. Select all of the true statements related to weighting and weighting systems:

[ ]A BCD with a dual point integrated weight system allows the diver to drop all or a portion of the weight being worn.

[ ]Once you have determined how much weight you need in the ocean, you never need to adjust the amount of weight you will use.

[ ]The only way to secure molded weights with slots to a standard weight belt is through the use of plastic or metal weight keepers.

[ ]Weight should be worn balanced on both sides of the diver's body.

True/False, 10 points

28. Hookah is a safe, inexpensive, and effective system for shallow water diving. Shallow water diving is defined as 100' or less.

( )True ( )False

True/False, 10 points

29. Wireless communications equipment works best in open areas where there are relatively few underwater obstructions to block the signal.

( )True ( )False

True/False, 10 points

30. Sound signaling devices can gain attention even when people aren't looking in the direction of the diver, but visual signaling devices may be seen over greater distances than sound signaling devices may be heard.

( )True ( )False

True/False, 10 points

31. All dive computers use the same decompression algorithms.

( )True ( )False

True/False, 10 points

32. Even if a diver violates the computer model and good diving practice, most computers will continue to function and provide a “best guess” of the diver’s decompression status, but violating dive profiles may increase the chances of decompression sickness.

( )True ( )False

True/False, 10 points

33. Computers are typically much more liberal in calculating maximum dive times on multilevel dives than dive tables.

( )True ( )False

True/False, 10 points

34. It is standard practice for divers to share a single dive computer when diving.

( )True ( )False

Matching Drag and Drop, 10 points

35. Match the photography recording method with its recommended application:

Choice Correct Match Match

Still photography is best suited for documenting individual creatures, artifacts, or small features of a specific site.

Video is best suited to dynamic events and situations such as documenting animal behavior or conveying the expanse and spatial relationships between features of a dive site

True/False, 10 points

36. Good quality illumination from an underwater electronic flash is generally limited to distances of no greater than 6ft, even with the most powerful strobes.

( )True ( )False

Multiple Choice, 10 points

37. Submersible pressure gauges (SPG) have largely replaced reserve valves, but prior to the advent of the SPG divers had to use a _____ if they wanted to reserve gas for an emergency.

( )Manual Override Valve ( )K valve

( )H valve ( )J valve

True/False, 10 points

38. Under no circumstances should the diver use his as a lifting device for retrieving heavy objects. Heavy objects is defined here as more than ten pounds (4.5 kilos).

( )True ( )False

Multiple Choice, 10 points

39. _____ of all cylinder explosions occurs during the fill process.

( )50% ( )90%

( )75% ( )30%

Multiple Choice, 10 points

40. The first stage of your regulator should be equipped with a sufficient number of ports to allow attachment of all necessary accessories. Assuming you are using a primary second stage and a standard octopus second stage, what is the minimum number of ports your first stage must have to allow you to wear a drysuit and feed the suit gas from your first stage?

( )6 ( )5

( )4 ( )3